There were no commercialradio stations until 1920.
直到1920年才有了商业电台。
《柯林斯英汉双解大词典》
2
Their competition and collaboration were creating the broadcasting industry in the United States, beginning with the introduction of commercialradio programming in the early 1920s.
从20世纪20年代早期引入商业广播节目开始,这些竞争与合作就在开创美国的广播产业。
3
After the war, he continued to work for commercialradio stations.